Abstract: A well system includes a production string that extends in a wellbore from a terranean surface toward a reservoir formation; and a portable gas injection system configured to supply the fluid to the annulus to reduce a hydrostatic pressure of a wellbore fluid enclosed within at least one of the annulus or the production tubing downhole tool coupled within the production string. The downhole tool includes a mandrel that includes a top connection connected to the production string and a bottom connection connected to the production string to fluidly couple the mandrel to the production string, at least one gas injection port that fluidly couples the mandrel to an annulus of the wellbore, and a valve positioned to control a flow of a fluid from the annulus into the mandrel through the gas injection port.

Abstract: A pipeline descaling tool includes a milling tool, a roller assembly and a motor. The milling tool can rotate about a longitudinal axis of the assembly and is sized to fit within an inner volume defined by a pipeline. The milling tool can mill, by rotating, solid obstructions protruding from an inner surface of the pipeline into the inner volume. The roller assembly includes multiple rollers. The roller assembly is axially coupled to the milling tool. The roller assembly can transport the pipeline tool assembly including the milling tool within the inner volume. The motor is connected to the roller assembly and to the milling tool. The motor can rotate the milling tool and power the roller assembly.

Abstract: A system for fishing a wire lost downhole in a wellbore includes a wire catcher assembly and a wire cutter assembly. The wire catcher assembly includes a body that encases an end of the wire, a wire guide attached to the body which directs the end of the wire into the body, a gripping mechanism that secures the wire within the body, and a wireline unit that moves the wire catcher assembly within the wellbore. The wire cutter assembly includes a cutting element that cuts the wire and a housing that positions the cutting element along the wire in the wellbore.

Abstract: A pipeline descaling tool includes a milling tool, a roller assembly and a motor. The milling tool can rotate about a longitudinal axis of the assembly and is sized to fit within an inner volume defined by a pipeline. The milling tool can mill, by rotating, solid obstructions protruding from an inner surface of the pipeline into the inner volume. The roller assembly includes multiple rollers. The roller assembly is axially coupled to the milling tool. The roller assembly can transport the pipeline tool assembly including the milling tool within the inner volume. The motor is connected to the roller assembly and to the milling tool. The motor can rotate the milling tool and power the roller assembly.

Abstract: One or more geometric dimensions of a portion of a washout section of a wellbore are determined. A retrievable tubular sleeve is run downhole through the casing string, such that a key profile disposed on an outer surface of the retrievable tubular sleeve connects with a landing nipple disposed on an inner surface of the casing string. The retrievable tubular sleeve is dimensioned such that, when the key profile is connected with the landing nipple, a portion of the retrievable tubular sleeve extends downhole from the downhole end of the casing string and within the portion of the washout section for which the one or more geometric dimensions have been determined, and an intervention or measurement tool can be run through the retrievable tubular sleeve through across the washout section.

Abstract: A pipeline descaling tool includes a milling tool, a roller assembly and a motor. The milling tool can rotate about a longitudinal axis of the assembly and is sized to fit within an inner volume defined by a pipeline. The milling tool can mill, by rotating, solid obstructions protruding from an inner surface of the pipeline into the inner volume. The roller assembly includes multiple rollers. The roller assembly is axially coupled to the milling tool. The roller assembly can transport the pipeline tool assembly including the milling tool within the inner volume. The motor is connected to the roller assembly and to the milling tool. The motor can rotate the milling tool and power the roller assembly.

Abstract: One or more geometric dimensions of a portion of a washout section of a wellbore are determined. A retrievable tubular sleeve is run downhole through the casing string, such that a key profile disposed on an outer surface of the retrievable tubular sleeve connects with a landing nipple disposed on an inner surface of the casing string. The retrievable tubular sleeve is dimensioned such that, when the key profile is connected with the landing nipple, a portion of the retrievable tubular sleeve extends downhole from the downhole end of the casing string and within the portion of the washout section for which the one or more geometric dimensions have been determined, and an intervention or measurement tool can be run through the retrievable tubular sleeve through across the washout section.

Abstract: A choke valve is coupled to a Christmas tree on a wellhead. A smart module is coupled to the choke valve. A hydraulic control is coupled to the smart module and the choke valve. The hydraulic control unit hydraulically actuates the choke valve. A first sensor is attached upstream of the choke valve and a second sensor is attached downstream of the choke valve. The first sensor measures an upstream pressure and the second sensor measures a downstream pressure. A controller is coupled to the smart module and the hydraulic control unit. The smart module receives the upstream pressure, the downstream pressure, and well data to generate commands to adjust a choke size of the choke valve corresponding with a required production rate of a well. The controller manages a transmission of hydraulic pressure from the hydraulic control unit to actuate the choke valve based on the generated commands.

Abstract: A well tool assembly to cut a wellhead gate valve by water jetting includes a water jetting head lowered into a wellhead tree coupled to a wellbore. The head includes a housing, an orifice plate and a jetting port. The housing defines a tubular region to receive water. The orifice plate is positioned within the tubular region downstream of a first end and upstream of a second end of the housing, and defines an orifice to accelerate a flow rate of the water received at a first flow rate upstream of the orifice plate to a second flow rate, greater than the first, downstream of the plate. At the second flow rate, the water can mill a gate valve within the wellhead. The jetting port is downstream of the orifice plate, and can receive the water at the second flow rate and guide the received water to the gate valve.

Abstract: A well tool assembly to cut a wellhead gate valve by water jetting includes a water jetting head lowered into a wellhead tree coupled to a wellbore. The head includes a housing, an orifice plate and a jetting port. The housing defines a tubular region to receive water. The orifice plate is positioned within the tubular region downstream of a first end and upstream of a second end of the housing, and defines an orifice to accelerate a flow rate of the water received at a first flow rate upstream of the orifice plate to a second flow rate, greater than the first, downstream of the plate. At the second flow rate, the water can mill a gate valve within the wellhead. The jetting port is downstream of the orifice plate, and can receive the water at the second flow rate and guide the received water to the gate valve.

Abstract: A first well, configured to act as a production well or an injection well, is formed. The first well includes a first horizontal portion. A second well, configured to act as a production well or an injection well, is formed. The second well includes a second horizontal portion substantially parallel to the first horizontal portion. The first horizontal portion and the second horizontal portion are at different depths. A fluid is injected into a geologic formation through the first well for a first duration of time. Hydrocarbons are produced from the geologic formation through the second well for the first duration of time. A fluid is injected into a geologic formation through the second well for a second duration of time. Hydrocarbons are produced from the geologic formation through the first well for the second duration of time.

Abstract: A system includes a choke valve coupled to a Christmas tree on a wellhead. A smart module may be coupled to the choke valve. A hydraulic control unit may be coupled to the smart module and the choke valve. The hydraulic control unit hydraulically actuates the choke valve. A first sensor may be attached upstream of the choke valve and a second sensor may be attached downstream of the choke valve. The first sensor measures an upstream pressure and the second sensor measures a downstream pressure. A controller may be coupled to the smart module and the hydraulic control unit. The smart module receives the upstream pressure, the downstream pressure, and well data to generate commands to adjust a choke size of the choke valve corresponding with a required production rate of a well. The controller may manage a transmission of hydraulic pressure from the hydraulic control unit to actuate the choke valve based on the generated commands.

Abstract: A fluid conduit defines a fluid passage from a well annulus to a venting system. A first pressure safety valve is positioned within the fluid passage. The first pressure safety valve is configured to open at a first set pressure. A second pressure safety valve is fluidically connected in series with the first pressure safety valve. The second pressure safety valve is configured to open at a second set pressure.

Abstract: A well tubing system includes a well tubing extending from a wellhead and disposed in a wellbore, and multiple capillary tubes coupled to the wellhead and extending from the wellhead into an annulus formed between an outer surface of the well tubing and a wall of the wellbore. The multiple capillary tubes provide a sealing fluid to the annulus, and extend to a respective multiple depths in the wellbore, where the multiple depths are different from each other. The capillary tubes guide the sealing fluid from the wellhead into the annulus, and provide the sealing fluid to the annulus.

Abstract: A fluid conduit defines a fluid passage from a well annulus to a venting system. A first pressure safety valve is positioned within the fluid passage. The first pressure safety valve is configured to open at a first set pressure. A second pressure safety valve is fluidically connected in series with the first pressure safety valve. The second pressure safety valve is configured to open at a second set pressure.

Abstract: A first well, configured to act as a production well or an injection well, is formed. The first well includes a first horizontal portion. A second well, configured to act as a production well or an injection well, is formed. The second well includes a second horizontal portion substantially parallel to the first horizontal portion. The first horizontal portion and the second horizontal portion are at different depths. A fluid is injected into a geologic formation through the first well for a first duration of time. Hydrocarbons are produced from the geologic formation through the second well for the first duration of time. A fluid is injected into a geologic formation through the second well for a second duration of time. Hydrocarbons are produced from the geologic formation through the first well for the second duration of time.

Abstract: A well tubing system includes a well tubing extending from a wellhead and disposed in a wellbore, and multiple capillary tubes coupled to the wellhead and extending from the wellhead into an annulus formed between an outer surface of the well tubing and a wall of the wellbore. The multiple capillary tubes provide a sealing fluid to the annulus, and extend to a respective multiple depths in the wellbore, where the multiple depths are different from each other. The capillary tubes guide the sealing fluid from the wellhead into the annulus, and provide the sealing fluid to the annulus.